slew bearing

Slew Bearing for Stacker Relaimer

Stacker reclaimer, also known as bucket wheel stacker reclaimer, stacker and reclaimer, is a new type of high-efficiency continuous loading and unloading machine. According to different usage scenarios, it can be further divided into: circular stockyard mixing stacker reclaimer and bucket wheel stacker reclaimer.

It is a new type of high-efficiency continuous loading and unloading machine, mainly used for loading and unloading iron ore (sand), coal, sand, etc. The machine is widely used at home and abroad because of its high operating efficiency. Shanghai, Ningbo, Guangzhou, Qinhuangdao, Qingdao, Rizhao, Nanjing and other ports in mainland my country already have this kind of machinery. The stacker reclaimer generally consists of four parts: luffing mechanism, running mechanism, bucket wheel mechanism and slewing mechanism.

It is a stacking and reclaiming equipment installed in a closed circular material room. The equipment adopts continuous herringbone stacking and comprehensive retrieving process, and the number of stacking layers can reach 500 layers. This equipment is mainly used in cement, chemical, coal, thermal power and other projects. This kind of stacker reclaimer is mainly composed of four parts: stacker, center column, reclaimer and center drop hopper.

The stacker reclaimer has two operation modes: stacking and reclaiming. Bulk material stacked by the belt conveyor is unloaded to the belt conveyor on the boom through the tail truck, and dumped from the front end of the boom to the stockyard. Through the operation of the whole machine, the rotation and pitch of the boom can make the material pile form a neat shape with a trapezoidal section. The reclaiming is realized continuously through the rotation of the arm frame and the rotation of the bucket wheel. The material is discharged to the arm frame belt conveyor running in reverse through the unloading plate, and then discharged to the belt conveyor in the material yard through the funnel below the center of the machine. Through the operation of the whole machine and the rotation and pitching of the boom, the bucket wheel can take out all the materials in the storage pile.

Gear pumps, solenoid valves and various valve parts in the hydraulic system; wear parts of hydraulic cylinders; various protection devices and material level switches; wear of reducers, brakes and wheels in the traveling mechanism; whether the bearings of each rotating part are in good condition, And decide whether to repair or replace according to the service life and usage of the worn parts.

Why you need a replacement of slew bearing for stacker relaimer?

A slew bearing is a rotational rolling elements bearing that supports and allows yard machines to operate on a horizontal axis. The slew ring assemble is located between the non-rotating base frame and the rotating slew deck structure. There are many used in almost all yard machine applications. Many different types of bearings have been applied to yard machines over the years as technology and requirements have evolved. Wear and tear from years of services on the slew bearing, the centerpiece of slewing machines, can cause a myriad of problems. As the bearing races wear both vertically and laterally, issues such as: Structural interference, Machine instability, Range of motion restrictions. Slew drive damage can affect the availability of your machine. Waiting too long to change the slew bearing can result in lengthly, unplanned downtime for your operation.

Choose AGICO Cement's slew bearing --we have multi-type slew bearings

Slew bearing is a large bearing with a special structure that can bear comprehensive loads such as large axial loads, radial loads, and overturning moments at the same time, and integrates multiple functions such as support, rotation, transmission, and fixation. In general, slew bearing itself has installation holes, lubricating oil and sealing devices, which can meet the different needs of various hosts working under various working conditions; on the other hand, slew bearing itself has a compact structure, guided rotation It is convenient, easy to install and easy to maintain, and is widely used in large-scale slewing devices such as lifting and transportation machinery, mining machines, construction machinery, port machinery, wind power generation, medical equipment, radar and missile launchers.     
Single-row four-point contact ball type slew bearing is composed of inner ring, outer ring, steel ball and spacer block. It has compact structure, light weight, four-point contact between steel ball and arc raceway, and can bear axial force and radial force. Construction machinery such as rotary conveyors, welding manipulators, small and medium-sized cranes and excavators can be selected.

The double volleyball slew bearing has three seat rings, steel balls and spacers can be directly discharged into the upper and lower raceways, and the upper and lower rows of steel balls with different diameters are arranged according to the stress situation. This kind of open assembly is very convenient, the load-bearing angle of the upper and lower circular arc raceways is 90°, which can withstand large axial force and overturning moment. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed. The axial and radial dimensions of the double-row different-diameter ball slewing ring are relatively large, and the structure is tight. It is especially suitable for loading and unloading machinery such as tower cranes and truck cranes that require medium or larger diameters.     
Single-row cross-roller slew bearing, composed of two seat rings, is compact in structure, light in weight, high in manufacturing precision, small in assembly clearance, and requires high installation precision. Force, tipping moment and large radial force are widely used in lifting transportation, construction machinery and military products.

The three-row roller slew bearing has three seat rings, and the upper and lower raceways and radial raceways are separated, so that the load of each row of rollers can be determined exactly. It can withstand various loads at the same time. It is the one with the largest bearing capacity among the four products. It has larger axial and radial dimensions and a firm structure. It is especially suitable for heavy machinery that requires a larger diameter, such as bucket wheel excavators, wheel loaders, etc. Type cranes, marine cranes, port cranes, molten steel running tables and large-tonnage truck cranes and other machinery.

Slew bearings generally have mounting holes, internal or external gears, lubricating oil holes and sealing devices, which can make the host machine design compact, easy to guide, and easy to maintain. There are four types of slewing ring bearings: gearless, external gear and internal gear four-point contact ball bearings, double-row angular contact ball bearings, crossed cylindrical roller bearings, crossed tapered roller bearings, and three-row cylindrical roller composite bearings. series, in which the four-point contact ball bearing has a higher static load capacity, the crossed cylindrical roller has a higher dynamic load capacity, and the pre-interference of the crossed tapered roller bearing can make the bearing have greater support rigidity and rotation accuracy, The three-row cylindrical roller combination bearing has higher bearing capacity due to the increase in bearing capacity, and various forces are borne by different raceways, so the bearing diameter can be greatly reduced under the same force. The size of the slewing bearing is very large. It is not set on the mandrel and installed in the bearing box like ordinary bearings. Instead, it is fastened to the upper and lower supports by screws.